Anomalous dispersion of the acoustic mode in liquid Bi

M. Inui, Y. Kajihara, S. Munejiri, S. Hosokawa, Ayano Chiba, K. Ohara, S. Tsutsui, A. Q R Baron

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7 Citations (Scopus)

Abstract

Inelastic x-ray scattering measurements on liquid Bi were carried out. Prominent acoustic mode excitations were observed in the dynamic structure factor to beyond 12nm-1, which resolves previously conflicting results as to their presence beyond 6nm-1. We find the dispersion curve of the excitation energy with momentum transfer is nearly flat from 7 to 15nm-1 consistent with ab initio calculations of liquid Bi [J. Souto, Phys. Rev. B 81, 134201 (2010)PRBMDO1098-012110.1103/PhysRevB.81.134201]. Our ab initio and classical molecular dynamics simulations suggest that a long-range force is needed to reproduce the flatness of the dispersion curve, and the long-range force is correlated with a local structure consisting of shorter and longer bonds in the liquid.

Original languageEnglish
Article number054206
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number5
DOIs
Publication statusPublished - 2015 Aug 25

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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    Inui, M., Kajihara, Y., Munejiri, S., Hosokawa, S., Chiba, A., Ohara, K., Tsutsui, S., & Baron, A. Q. R. (2015). Anomalous dispersion of the acoustic mode in liquid Bi. Physical Review B - Condensed Matter and Materials Physics, 92(5), [054206]. https://doi.org/10.1103/PhysRevB.92.054206